Improvement in car-wheels



UNITED STATES PATENT JOHN B. TARR, OF FAIRHAVEN, MASSACHUSETTS.

IMPROVEMENT IN CAR-WHEELS.

Specification forming part of Letters Patent No. 159,530, dated February 9, 1875; application filed August 19, 1873.

To all whom it may concern:

Be it known that 1, JOHN BLAKE TARR, of Fairhaven, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Railroad-Oar Wheels: and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad to the accompanyingdrawiugs. making part of this specification, in which- Figure 1 is a view of the outside of the improved wheel. Fig. 2 is a diametrical section through the wheel. Fig, 3 is a perspective view of the center plug.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to an improvement on railroad-car wheels, which are made of metal that is so hard that it is very difficult or impossible to bore or ream out their eyes after the wheels are cast. My object is to construct such wheels with an eye or central portion, which can be readily bored out after the wheels are cast, as will be hereinafter explained.

The following description of my invention will enable others skilled in the art to understand it.

In the accompanying drawings, A represents the rim of a car-wheel. B represents the web of the same, and 0 represents a central tubular portion of metal, which is comparatively softer than the portions A B. The tubular portion 0 is made with grooves a and circular indentations b in its periphery, as shown in Fig. 3, or the grooves or indentations may be arranged in any other suitable manner-for instance, they may be parallel to the longitudinal axis of the tube, spiral, or

a number of circular holes may be drilled into the periphery of the tube. Such a tube is adjusted in the center of the mold, in which a car-wheel is to be cast, and the metal which is to form the portions A B of the wheel poured around it. The tube 0 Will be permanently secured into the wheel, owing to the metal filling up the grooves or indentations made into the periphery of this tube G. I thus construct a wheel, partly of a very hard metal, to which is firmly united a central eye or bushing, which is comparatively soft, and which can be drilled or reamed out to fit an axle at very little expense of time and labor.

If desired, the tubular bush 0 may be made slightly tapering, although I do not deem this necessary, as a complete union of the bush with the hard metal will be efiected by simply indenting the bush, as described.

By my invention the hardest metal known can be adopted in the manufacture of carwheels without liability of the metal cracking during the casting process, and without having the edges of the wheels so hard that they cannot be easily drilled or reamed out.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

A car-wheel, having a hard metal rim, web, and hub in one piece, with a comparatively soft metal bush, combined therewith by projections and recesses a and I), substantially as described, and for the purpose set forth.

JOHN BLAKE TARR.

Witnesses:

J. N. CAMPBELL, JAMES MARTIN, Jr,

FFICE 

